Adorama offers the Tenba 13" Small Messenger Multipurpose Case in Platinum, model no. 638-368, for $39.99 with free shipping. That's the lowest total price we could find in any color by $33, although most stores charge $90 or more. It fits laptops up to 13", and features a quick access zipper, webbing loops, and a 1000-Denier nylon exterior.
Of note, Focus Camera via Amazon offers the Tenba 15" Small Messenger Laptop Bag
in Black, model no. 638-221, for $59
with free shipping
. That's the lowest total price we could find by $46. It holds laptops up to 15", as well as a DSLR camera and accessories, and features Duraflex clips, welded steel D-rings, and over 20 pockets.